You cannot combine the different courses because they have different job descriptions, as far as employment is concerned, although they need to take up 3-4 subjects related to the other courses. But they are only the basic ones. Accountancy for example, it must include ecomonics for accountancy has something to do with it, by doing statements of account or year end reports. As the courses go deeper, the students can have better understanding or more complicated subjects. So, if you will combine just these two courses, well, it's so hard on the part of the students.
I hope you get my point here.